Over the past few years, e-discovery has had to contend more often with data from chat and collaboration platforms stored in various parts of the world. But while it's becoming a common occurrence, vendors said regulatory restrictions and tech limitations are still complicating their international e-discovery matters.

The days of custodians' data resting exclusively in domestic platforms are fleeting, said Leigh Vickery, chief strategy and innovation officer of e-discovery and compliance provider Level Legal. But regulators haven't eased up on their control of data.

"If you're dealing with things outside of the U.S., non-U.S. companies [or] non-U.S. chat platforms it's a completely different set of challenges," Vickery said.